Chemical Kinetics Explorer

Rate laws, energy diagrams, and the time-course of A → P.

ΔG vs ΔG‡ — where it stops vs how fast it gets there

Drag the peak to set the activation barrier (controls rate k). Drag the product floor to set the overall energy change (controls Keq). They move independently.

ΔG (kJ/mol)
-10.0
Keq
~50
ΔG‡ fwd (kJ/mol)
50.0
ΔG‡ rev (kJ/mol)
60.0
kfwd (s⁻¹) krev (s⁻¹)
Uncatalyzed — —
Notice: the ratio kfwd / krev equals Keq. A catalyst speeds up both directions by the same factor, so Keq is unchanged.
Catalyst
Show
Energy levels
ΔG‡ 50.0 kJ
ΔG -10.0 kJ
Temperature
25.0 °C

Watching A → P over time

Each dot is a molecule of A. Every frame, each dot has a small probability of converting to P. The half-life t½ is when half are gone.

k (s⁻¹)
0.100
t½ (s)
6.93
Time (s)
0.0
% A remaining
100
Rate constant
k (s⁻¹) 0.100
Population
Molecules 200
Display
Ideal curve
t½ markers
Simulation
cochranlearning.com · interactive chemical kinetics